在 2014年3月25日星期二UTC+8下午3时49分09秒，dieter写道： > Wesley <nisp...@gmail.com> writes: > > > > > I am trying to use gdb debug python script. > > > I am using gdb7.7 and python2.7.6, here is my simple test script: > > > import time > > > > > > def next(i): > > > time.sleep(10) > > > i = 1 - i > > > > > > i = 1 > > > while True: > > > next(i) > > > When this script running, gdb attach to it, and here is snippet: > > > > > > ... > > > (gdb) frame 5 > > > #5 0x00000000004d01a7 in PyEval_EvalFrameEx (f=Frame 0x201e130, for file > > test.py, line 6, in next (i=1), throwflag=0) at Python/ceval.c:2666 > > > 2666 x = call_function(&sp, oparg); > > > (gdb) py-locals > > > i = 1 > > > (gdb) pyo i > > > No symbol "i" in current context. > > > > Quite a lot of time has passed since I last had to debug Python > > processes at C level -- thus, my memory may be unreliable. > > > > When I remember right, then "pyo" is used to interprete > > a C level variable as a Python object (and print it) -- not > > a Python level variable. In your case, "i" is a Python level variable. > > > > You must carefully distinguish between the C level and the Python level. > > Some commands expect C level names/objects; > > others may expect Python level names/objects. > > > > To learn how you can obtain the value of a Python variable, > > I see two approaches: look through the list of provided commands > > (and their documentation) and try to figure out which might be applicable > > and then may some tests; or look at the implementation of "py-locals" > > and use this knowledge to define you own command (for this, > > you will also need to understand the gdb language to define commands).
Hi Dieter, Thanks. Actually, I can now see the varialbe names at Python level and C level. I just want to verify x command to monitor the memory content. So, in my origin post, I can get variable i's address, and see the value is 1, then, I wanna have a try x command, the issue is, when use x/format i's address, the output is not 1, but other things:-( -- https://mail.python.org/mailman/listinfo/python-list
